438 APHIDS OF THE ROCKY MOUNTAIN REGION 
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1908. The aphid genus Forda. Psyche 15: 67-68. 
RONDANYI, C. 
1847. Esapodi afidicidi. Nuove Ann. Sci. Nat. (Bologna 1848) 
1852. Aphis graminum n. sp. Nuove Ann. Sci. Nat. e. Rendic. Bologna, 6, Ser. 3: 9-11. 
ROSS, WILLIAM A. 
1915. Orchard Insects. 45th Ann. Rpt. Ent. Soc. Ontario, 1914: 22-24. 
1917. The secondary host of Myzus cerasi. Canad. Ent. 49: 434. 
1918. The black cherry aphis. Agr. Gaz. Canada 5(1): 13-16. 
SANBORN, CHARLES EMERSON 
1904. Kansas Aphididae. Kansas Univ. Sci. Bul. 3: 1-82. 
1906. Kansas Aphididae. Kansas Univ. Sci. Bul. 3: 225-274. 
SANDERSON, E. DWIGHT 
1900. The strawberry root louse. The destructive pea louse in Delaware. Delaware Col. 
Agr. Expt. Sta. Bul. 49: 3-24. | 
1901a. Report of the entomologist. Ann. Rept. Delaware Col. Agr. Expt. Sta. 12: 142- 
Zt: 
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1902. Report of the entomologist. Ann. Rept. Delaware Col. Agr. Expt. Sta. 13: 127-199. 
SCHOENE, W. J. | 
1935. Schoene and Underhill. Life history and migration of the apple woolly aphis. Vir- 
ginia Agr. Expt. Sta. Tech. Bul. 57: 1-31. 
SCHRANK, F. V. P. 
1801. Fauna Boica, II Ingolstadt, 2: 102-139. 
SCHUMACHER, FRIEDRICH 
1921. Aphidologische Notizen I. Zool. Anz. 53: 181-186. 
SCOPOLI, J. A. 
1763. Entomologia Carniolica. 
SHIMER, HENRY 
1867. On a new genus of Aphidae. Trans. American Ent. Soc. 1: 283-285. 
SHINJI, O. RIHAY G. 
1930. Some new aphidids from North Eastern Japan. Lansania, 2: 151-160. (Nov.) 
SIMMS, K. 
1927. Korowka welnista (Schizoneura lanigera Hausm.) Studja nad biologja. Tow. 
Ogrodn, w. Krakowie. (See R.A.E. 24: 814) 
SIRRINE, F. A. 
1893. A new species of Pemphigus occurring on thorn. Proceedings Iowa Academy Sci- 
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SMITH, CLYDE F. 
1937a. The aphid genus Flabellomicrosiphum in Utah. Pan-Pacific Ent, 13: 127-130. 
1937b. Smith and Knowlton. Macrosiphum aphids infesting Chrysothamnus and Gutier- 
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1938. Smith and Knowlton. The aphid Genus Microsiphum in Utah and Idaho. Ann. 
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1939. Smith and Knowlton. Three intermountain aphids. Can. Ent., 71: 241-3. (Nov.) 
1940. Smith and Knowlton. Three aphids of the genus Brevicoryne van der Goot, Annals 
Ent. Soc. America 33: 404-405. 
1941. The Genus Drepanaphis Del Guercio East of the Rocky Mountains. Journ. Elisha 
Mitchell Sci. Soc. 57: 226-242. 
1943. Smith and Knowlton. The aphid genus Drepanaphis Del Guercio. Jour. Elisha 
Mitchell Sci. Soc., 59: 171-176. (Dec.) 
SMITH, ERWIN F. 
1890. The black peach aphis. Entomologica Americana 6: 101-103. 
SMITH, JOHN B. 
1890, Plant lice and how to deal with them. N. J. Agr. Exp. Sta. Bul. 72: 110-119. 
1900. The apple plant louse. N. J. Agr. Expt. Sta. Bul. 143: 1-23. 
1909. Insects injurious to strawberries. N. J. Agr. Exp.,Sta. Bul. 225: 24-29. 
SMITH, RALPH H. 
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1923. The clover aphis: Biology, economic relationships and control. Idaho Agr. Expt. 
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1924. Ul ar sdera ce aerate ae Cir. 26, Idaho Agr. Expt. Sta. 
